ALSA: cs4281: More constification

Apply const prefix to the static register table.

Just for minor optimization and no functional changes.

Link: https://lore.kernel.org/r/20200105144823.29547-62-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/cs4281.c

@@ -1939,7 +1939,7 @@ static void snd_cs4281_remove(struct pci_dev *pci)
  */
 #ifdef CONFIG_PM_SLEEP
 
-static int saved_regs[SUSPEND_REGISTERS] = {
+static const int saved_regs[SUSPEND_REGISTERS] = {
 	BA0_JSCTL,
 	BA0_GPIOR,
 	BA0_SSCR,